class_docstr: ReferenceText input is either a sequence of lines without LF or a single string
  to be split into lines on LF
code: def _save(self, doc, fp):
      doc = _ensure_lines(doc)
      for line in doc:
          print(line.rstrip("\n"), file=fp)
  
imports: import datetime
  import decimal
  import difflib
  import json
  import os
  import traceback
  from collections.abc import Iterable
  from typing import Any
label_desc: Use image node_id 2 for calling the ReferenceText obj's underlying member method code with example usage: obj._save(doc, fp) without return types